The Collaborative International Dictionary of English v.0.48:

Governance \Gov"ern*ance\, n. [F. gouvernance.]
   Exercise of authority; control; government; arrangement.
   --Chaucer. --J. H. Newman.
   [1913 Webster]

WordNet (r) 3.0 (2006):

governance
    n 1: the persons (or committees or departments etc.) who make up
         a body for the purpose of administering something; "he
         claims that the present administration is corrupt"; "the
         governance of an association is responsible to its
         members"; "he quickly became recognized as a member of the
         establishment" [syn: administration, governance,
         governing body, establishment, brass, organization,
         organisation]
    2: the act of governing; exercising authority; "regulations for
       the governing of state prisons"; "he had considerable
       experience of government" [syn: government, governing,
       governance, government activity, administration]

The Free On-line Dictionary of Computing (30 December 2018):

information technology governance
governance
IT governance

    The structure, oversight and management processes
   which ensure the delivery of the expected benefits of IT in a
   controlled way to help enhance the long term sustainable
   success of the enterprise.

   (2009-04-27)